Power receiver LSI

Power transmitter LSI

Datasheets

Function Overview

Power Supply
(V)

OperatingFrequency

Data
Flash
(Byte)

I/F

ADC
(Method)

Operating Temperature
(°C)

PKG

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Overview

LAPIS Semiconductor's 13.56 MHz wireless charging chip set, "ML7630" and "ML7361", are designed for wireless charging system using the 13.56 MHz for power transfer. Small devices such as wearable and hearable devices with a limited space for antenna implementation can be "connectorless" because the antenna can be downsized by using this bandwidth.

Power receiver LSI "ML7630" can provide 200mW of a charging output. It also includes Tag function to allow Bluetooth® pairing, etc. by NFC touch. These functions are included in a WL-CSP package of 2.6 × 2.6mm.

Power transmitter LSI "ML7631", integrates functions necessary for power transmission such as detecting the dropout of the power receiver device, setting the power transmission output level, etc. into one chip, controlling the operating voltage to 5 V to ensure the operation from a USB power supply such as mobile battery. It can also mobilize the entire power charging system and is the optimum system for achieving a wireless power supply solution for small devices such as wearables.

Product feature

Feature1

Super small chip with the power receiver function "ML7630", build-in software removes the need for software development

Power receiver LSI "ML7630" can incorporate the power receiver function in a 2.6mm WL-CSP package, with only external parts of a condenser in addition to a charger IC and four rectifier diodes.

Both "ML7630" and "ML7631" have a built-in software and no further development is necessary. Settings for each user can be configured separately from the PC tools provided by LAPIS Semiconductor.

Feature2

Equipped with NFC Forum Type3 Tag function

Power receiver LSI "ML7630" has NFC Forum Type3 Tag function.

This is a ROM function that can read a fixed data written in advance in NDEF format* to a build-in 1 KB data flash. It can also communicate with an external NFC reader/writer via the tag data.

ML7630 can control the LDO output within the proper temperature range by using an external thermistor for measuring a charging temperature.

Temperature can be measured in two ways: by the build-in 10 bit ADC with software and by the build-in hardware comparator.

Charging temperature can be controlled by both methods to ensure a highly reliable Li-ion battery charge, for which the charging temperature is important.

Feature4

Driven at 5V can mobilize the entire system

The power supply voltage of "ML7631" is 5V, which can be driven by a USB power supply such as mobile battery.

Since "ML7630" does not need power supply, mobile battery + "ML7631" + "ML7630" + target device to be charged, for example, can be configured and the entire system can be mobilized.

Feature5

Optimization of power transmitter

"ML7631" provides a function to adjust the power transmitter.

"ML7630", on the other hand, determines the voltage after rectification by the build-in ADC as well as any power shortage or surplus from unnecessary current passing through the build-in shunt regulator, and then notifies that information to "ML7631", allowing "ML7631" to eliminate unnecessary power transmission and to optimize the amount of power transmission.

Feature6

High-level safety by the detection function of foreign object and the dropout of the device

"ML7631" detects changes in power transmitter current/voltage by the build-in 10 bit ADC and stops the LDO output. It detects a metal piece or IC card to prevent heat or damage.

It also detects when "ML7630" goes out of the wireless charging range to prevent unnecessary power transmission.

Applications

System with a rechargeable battery about 50 mAh

LAPIS Semiconductor's 13.56 MHz wireless charging chip set is useful for building a wireless charging system for compact devices with a limited space such as wearable devices with a rechargeable battery about 50 mAh, Bluetooth® headset, earphone, etc.

LSI Evaluation Kit

EvaluationBoardOutline

Evaluation Board Contents

Note

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Evaluation kit provided

Evaluation kit provided

Evaluation kit for the wireless charging chip set is available. The evaluation board for operation check comes with connection cables and software tools, etc. (Attachments may change for each LSI.)